Sending mail solid color darker flat icons - Stock vector

sending mail, sending-mail, sending, post, transfer, courier, deliver, delivery, deliverer, outbox, outgoing, outbound, addressee, target, mail, letter, message, email, e-mail, correspondence, newsletter, information, messaging, communication, communicate, envelope, postal, postage, mailbox, mail-box, letterbox, horn, postal horn, postal-horn, round horn, round-horn, trumpet, service, solution, silhouette, solid-icon, solid, icons, round, circle, circular, orbicular, symbol, set, flat